单项选择题

Computer are beneficial because they ______.

A．eliminate price errors
B．give itemized printout to the customer
C．save time in the checkout lane and help control inventory
D．all of the above
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单项选择题
What information CANNOT be obtained from the UPC
A．Manufacturer.
B．Grocery store name.
C．Item.
D．Price.
单项选择题
Codes are scanned by ______.
A．the checkout clerk
B．a laser beam of light
C．the customers themselves
D．the cash register
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